Dishwashing machine



' Jan, 6. 1925.

.c. J. o. BERGSTROM msmmsume MACHINE Filed June 1 5, 1922 2 Sheets-Sheet1 llllllllll IIEUMII M Y. b 0. R

T w R F? M A I v 1 a J n /W m c. J. o. BERGsTROM' DISHWASHING MACHINEFiled June 13, 1922 2 Sheets-Sheet 2 CARL \JOHAN'OSCAR BEnssTnM 45 rrangedin such manner relatively to the Patented Jan. 6, 1925.

uu rsu s'rA'rss PATENT OFFICE.

cant JOHAN oscan zenaes'rnbm, or EBBES :BRUK, NEAR. nusxvanna, swnmm.

msnwa'smne momma.

Application and June 13,1922. Serial m5. 568,004.

To all whom it may concern:

Be it known that I, CARL JOHAN OSCAR Bnnes'rnoM, a subject of the Kingof Sweden, residing at.Ebbes Bruk, near Huskvarna, Sweden, have inventeda new and useful Improvement in Dishwashing Machines (for which I havemade apphcation in Sweden, Dec. 22, 1920, No. 5900/1920),-of

which the following is a specification.

with a less consumption of power than those heretofore required insimilar machmes, so

that .the machine maybe used with advantage also in smallestablishments. I The invention is principally characterized by thisthat the device or spurting water on the dishesconsists of a combinedfan and pump, which is arranged in such manner that the pump draws waterfrom the bot- .tom of the tank to the fan, which communicates with anair inlet and thus draws in air by means of which. it throws the wateragainst the dishes. In this manner the resuit is attained that the watermay be great velocity and with a considerably smallerv consumption ofpower than by the use. of an ordinary. ump which only pumps water, andin additionthe air also aids in blowing the dishes clean. When thedishes.

have been washed in this manner the water is drained .off, so that onlyair is blown against the dishes which in this manner will be dried inthe courseof a few minutes. The combined fan and pump may suitably bearcage that the dishes laced in said cage are squirted with water maninclined direction from below upwards. -In this manner also deep bowls,such as cups and the like, which are placed in inverted position in thecage, may be washed clean without said 'bowlstaking up water which wouldof course noosesitate an increase of the quantity of c1r--culatingwater.

; n the accompanying drawings two em- The present invention relates toan imthrown against the dishes with the required bodiments oftheginvention are illustrated by way of example. Fig. l'shows a'verticalsection of a dish-washing machine according to the invention, and Fig. 2shows a plan now of the same.- Fig. 3 shows a section and Fig. 4 a topview, partly insection, of the combined fan and pump. 'Fi 5 shows aslightly modified construction'o the dish-" washing machine in verticalsection.

Inthe embodiments illustrated, '1 denotes the tank of the, machine whichis supported by the feet 2. The tank 1 may either be open at the top, asin the construction illustrated in Figs. 1 and 2, or provided with a lid3, as shown in Fig. 5. In said tank there is provided a cage 4 forreceiving the dishes; In the embodiments illustrated said cage consistsof two portions, a lower portion for receiving plates and other largearticles, and an upper portion .for cups and the. like. .The'cage isrotatably supported on a shaft 5 projecting from the bottom of thetank1, so 'that said'cage maybe caused to rotate bythe'waterwhich isv thrownupon the dishes. e

I A: casing 6 for the combined fan and pump is secured to one side ofthe tank 1, the interior of said casing being in open co unication withthe tank 1. In the embodi ts illustrated the combinedfan and pump isformed by a single bucket wheel which is secured to an inclined shaft 7.Said shaft 7 is journ'alled in bearings'encircled by an upstandingsleeve 16 on a memher'i'l which'is secured to and forms alid of the Ycasing 6. A greasecup 18 is threaded into said sleeve 16 and serves tosupply lubricant v to said shaft 7, which is driven'by a small electricmotor'8 which is secured toa plate- 19 made integral with orattached tothe member 17. The bucket wheel is provided which extending along theshaft 7, are bent forward in the direction of rotation at theirencircled a cylindrical sleeve or ring 20 secured to said portions 9 andwhich acts to. conductithe water raised by said bucket portions, upwardsto the fan wheel blades 10..

The lower-portion of the bucket wheel, i. e.

with angular blickets or blades the legs9 of the bucket portions 9 andthe encircling sleeve .20, thusforms a pump whichraises the waterto theupper portion of the bucket wheel, namely the blade portions 10 whichforma fan combined with said pump. The air inlet to said fan wheel islocated at 11, that is to say-at the pointwhere the axial and radialportions of the buckets or blades meet, and consists of a clearancespace or opening between the surface of the water in the tank and thelower edge of a partition or web 21 in the casing 6, which web 21,together with a portion of the wall of said casing 6, form a lower wallof a. casing for the fan wheel, the upper wall of such casing I beingformed by the member 17.

The tank 1 and the casing 6 are-intended" to be filled with water onlyto the level shown in Figs. 1 and 5, that is to say to such height thatthe lower portionof the Bucket wheel, i. e. the' pump wheel, operates inthe water, whereas the upper portion of the bucket wheel. i. e. the fanwheel, operates in air. Vhen the motor 8 .is started the pump wheel willraise water to the fan wheel, which draws in. air through the space oropening 11 and compresses such air in the fan wheel casing'formed by themember 17 and the casing 6 and web 21, and by means \of the aircompressed throws the water sides of the dishes which will thus bethoragainst the dishes with-such velocity that cage 4 begins to rotateon the shaft 5. .In this manner water .will be thrown on' all oughlycleaned. As shown in Figs. 1 and 5, the pump,the fanand the motor areplaced in such inclined position'that the water is thrown in an inclineddirection upwards bowls,

against the dishes in the cage 4. The water being thus thrown on thedishes in an inclined direction from below upwards it is possiblealsotowash cups and similar deep which are placed in the cage 4 ininverted position, which entails the advantage that no water remains inthe cups, but all water will immediately HOW to the bottom of thetank,again to be raised by the pump wheel. In this manner the quantity ofwater required in the machine is decreased.

In order toprevent the fan wheel from also operating in water, if byoversight the tank 1 is filled to a higher level than that intended, itis suitable to place the airjinlet to t e fan in communication with aseparate air inlet tube 12 which extends upwards to the upper portion ofthe tank 1, and the lower end of which opens just opposite the, airinlet 11 of the fan casing. In this man-' ner it is secured that the fanwheel will always draw in air even if the water level in the tank standshigher than the air inlet 11 to the fan In this manner overloading ofthe motor 8 is also avoided.

\ The tank 1 is provided in the usual manner with a bottom-drain 13which may be closed by. means of a valve and which serves the In theconstruction shown in Fig. 5," the shaft 5 which supports the cage 4, iscapable of .moving in vertical direction through a packing box 15 in thebottom of the tank 1, and is connected by means of a lever and linkmechanism with the lid 3, so that said lid will be automatically openedwhen the dishes have been washed and thecage with the dishes arelowered, so that said cage comes to rest .on the bottom of the tank.

I claim:

1.. In a dish-washing machine, the combination of a tank, a cage in saidtank for receiving the dishes, and'a combined fan and pump, including acasing provided with an air inlet to said fan, said pump being adaptedto raise water from the bottom of said tank to said fan, and said fanbeing adapted to draw air through said inlet and by means of such air tothrow the water against the dishes in said cage, for the purpose of 0b-.taining an eflicient washing of'the dishes 'with the smallest possiblequantity of water.

2. A dish-washing machine as claimed in side of the tank and in aninclined position so thatit will throw water in an inclined direction.upwards in the tank.

3. In a. dish-washing machine, the combination of a tank, a cage in saidtank for receiving the dishes, and a combined fan and pump, including acasing provided with an air inlet to said fan, said pump being adaptedto raise water from the bottom of said tank to said fan, and said fanbeing adapted to draw'air through said inlet and by-means of such air tothrow the water against the dishes in said cage, said combined fan andpump consistingof a single bucket wheel having a shaftand angularbuckets secured to said shaft, the legs of said buckets extendin alongsaid shaft having their lower ends bent forward in the direction ofrotation so as to be capable of raising water, and the other legs ofsaid buckets extending radially forming-a fan wheel, the air inlettosaid fan bein located at the point where said axial am? radial legs ofthe bucketsmee't.

4. A dish-washing machine as claimed in claim 3, in which an air-inlettube communicates with the airinlet to the fan and extends to the upperportion of the tank, for

the purpose that the fan wheel shall be capable of drawing in air alsoif the 'ater level in the tank is above the air inlt to the fan. emu.JOHAN oscAR BERGSTRiiH/i.

